* Spiky-eared Pichu's sprite in HeartGold and SoulSilver is in a different pose than that of a normal Pichu, but she retains the two frames that a normal Pichu uses in her animation; thus, she is the first Pokémon to have more than one frame other than its standard pose in its animation since {{v2|Crystal}}.

* Spiky-eared Pichu's sprite in HeartGold and SoulSilver is in a different pose than that of a normal Pichu, but she retains the two frames that a normal Pichu uses in her animation; thus, she is the first Pokémon to have more than one frame other than its standard pose in its animation since {{v2|Crystal}}.

* Spiky-eared Pichu is the only form difference that is not carried over into later games in the main series, as it cannot be transferred to [[Generation V]] games.

* Spiky-eared Pichu is the only form difference that is not carried over into later games in the main series, as it cannot be transferred to [[Generation V]] games.

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* Spiky-eared Pichu's inability to evolve is similar to that of the protagonists of [[Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness|Pokémon Mystery Dungeon: Explorers of Time, Darkness]] and [[Pokémon Mystery Dungeon: Explorers of Sky|Sky]]; in both cases, this was due to the fact that they had time traveled, but in the latter the protagonists can evolve.

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* Spiky-eared Pichu's inability to evolve is similar to that of the protagonists of [[Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness|Pokémon Mystery Dungeon: Explorers of Time, Darkness]] and [[Pokémon Mystery Dungeon: Explorers of Sky|Sky]]; in both cases, this was due to the fact that they had time traveled, but in the latter the protagonists can evolve eventually.

Spiky-eared Pichu (Japanese: ギザみみピチューGizamimi Pichu) is a female Pichu. Her physical appearance is no different from an ordinary Pichu, other than the three spikes at the tip of her left ear, hence her name.

In the games

She appears in Pokémon HeartGold and SoulSilver as an event Pokémon obtained in Ilex Forest. She will appear and join the player's party if the Pikachu-colored Pichu is brought to the shrine as the first Pokémon in the party. She has her own unique in-battle and overworld sprites and cannot evolve or be traded outside of HeartGold and SoulSilver. Aside from her unique sprite, moves, and inability to be traded or evolve, she is nearly identical to a normal Pichu in that her base stats are the same as a normal Pichu's. However, her maximum stats for the Pokéathlon are different. If a Pokémon uses Transform on it, it will have a spiky ear.

Shiny sprites for Spiky-eared Pichu exist in the coding of the games, although it is impossible to obtain due to the game assigning the Spiky-eared Pichu a fixed personality value that is predetermined according to the Trainer ID number and secret ID. This ensures that the personality value will never result in a Shiny nor a male Spiky-eared Pichu.

If taken to Professor Elm, it is revealed that she has traveled through time with Celebi. Elm claims that he and Professor Oak were researching the time travel abilities of Celebi, and claims that this Pichu proves his main theory. He adds that the reason it cannot evolve is because it has been time traveling for so long. He will then call all the Pokémon Center attendants to prevent Spiky-eared Pichu from being used in trades; however, the attendants would not permit it into a trading facility prior to this either. Spiky-eared Pichu is also unable to be transferred through the Poké Transfer into a Generation V game.

Spiky-eared Pichu's inability to be traded outside of HeartGold and SoulSilver can be explained as being preventative of trading an alternate form to a game in which it does not appear, as happens in Platinum, HeartGold, and SoulSilver when entering the trade center with Rotom in an appliance, Giratina in its Origin Forme, or Shaymin in its Sky Forme, by returning them to the forms they appeared in Diamond and Pearl. As Spiky-eared Pichu cannot freely change between forms, this explains the need to make her untradeable within Generation IV. However, it is unknown why her data does not exist in Generation V.

Trivia

A picture of a Pikachu short poster that featured Spiky-eared Pichu alongside Pikachu and Piplup was leaked several days before this Pokémon was officially revealed.

Spiky-eared Pichu's sprite in HeartGold and SoulSilver is in a different pose than that of a normal Pichu, but she retains the two frames that a normal Pichu uses in her animation; thus, she is the first Pokémon to have more than one frame other than its standard pose in its animation since Crystal.

Spiky-eared Pichu is the only form difference that is not carried over into later games in the main series, as it cannot be transferred to Generation V games.